Pressure-gage.



' To all whom it may concern.-

WED ATnsPATnn'r OFFICE.

PRESTON E. GIPLING, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO A.. SCHRADEBS SON, INCORPORATED, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

PRESSURE-GAGE.

Application filed November 2,

Be it known that I, PnnsrroN E. GILLING,

' a citizen of the United States, residing at lid pneumatic tires ;or the equivalent.

East Orange, in the county of Essex and State of New Jersey, have invented certain Improvements in Pressure-Gages, of which the following is a specification.

This invention relates more especially to that class of pressure gages which is used for ascertaining the air pressure in for automobiles and the like, although I of course do not wish to in any way restrict the use of the invention for any purpose for which it is adapted.

The objects of the invention are to provide such a pressure gage which will be thoroughly reliable and dependable; to secure a fool-proof construction, devoid of removable parts which might become detached and lost; to produce a gage compact in form and of neat and pleasing appearance to provide a simple construction, not liable to get out of order, and to obtain other advantages and results as may be brought out in the following description.

Referring to the accompanying drawings, in which like numerals of reference indicate the same parts throughout the several figures,

Figure 1 is aside view of my improved pressure gage showing the parts in retracted or idle position; Fig. 2 is a central longitudinal section, showing a certain gage sleeve partly extended;

Fig. 3 is a view similar to'that shown in gage sleeve extendthe casing and which is enlarged at the'tinnerjsidefofkthe plugas at 5, and at that when the pressure gag ,is applied to Specification of Letters Patent.

inflated The plug thus fits tightly against the wallsofhas a central airpassage 4- .therefrom. The the outer side commus .nicates with the atmosphere by a saw-slit 6 Thiszsaw-slit is oif'cen V ter, as shown in Fig. 4, morejespeciallygfso. jstantially sure Patented Aug; 2'7, 1918.

1911, Serial No. 658,077. Renewed June 27, 1916. Serial No. 106,263.

be closed by the usual valve stem. The said outer side of the plug 2 preferably lies a little inside the end of the casing 1 as shown, and has an outer annular recess 7 containmg a gasket 8 which is retained in said recess by slightly bending in the edges of the casing, as at 9, and which gasket further insures against any leakage of air between the plug 2 and the walls of the casing.

Within the casing 1 is a piston tube 10 -of considerably smaller diameter than the casing, having'an open end adapted to engage the inlet plug 2 around its air passage 4, or enlarged end- 5 thereof, and being closed at its opposite end 11, the said piston tube being preferably short enough in its retracted position will not project materially from the casing 1. A helical spring 12 in said piston tube 10, fast at one end to a pin 13 extending diametrically across the enlarged end 5 of the air passage 4, and at its other end'to a cross-pin 14. adjacent to the closed end of the piston tube,

ton tube seated against the inlet plug 2,

while permitting it to move outward under air pressure to an extent proportionate to the pressure.

' To provide a piston upon the inner end of the piston tube thus described, a ring 15 of leather or the like is arranged upon said tube 10, between two metal washers 16 and 17, held against a shoulder 18 on the tube by curling the end edges of the tube outward andbackward, as shown in Fig; 2.

Obviously, the piston tube will normally be retracted against the inlet plug 2 by the spring 12, but when the inletend of the gage is pressed to a tire valve, as is common, the compressed air therein will pass through so that said closed end 11 normally holds the said pisslide it until the piston tube is projected out of the casing to a greater or less extent,

accordin to the pressure being measured. For indicating the degreee of pressure, a gagev tube 19 incloses the piston tube 10 beyond the piston thereon, bein separate from said piston tube an loose outer end adapted to seat against the: outer closed end 11 of the piston tube whenretracted, thus lying within or subwithin the casing. When the piston and piston tube are projected'by a presmeasured, the gage tube is cartube 19 is closed and of said gage ried outward, too, and left in its 'position of farthest projection when the gage is removed from the tire valve and the piston and its tubeare retracted by the. spring. In

a .series of exterior grooves 25, which are engages the graduatedsurface of the gage tube and because of its frictional contact.

therewith will wipe said gage tube as it is slid out and in and keep the same clean and polished whereby the graduations and numbering thereon may be easily read at any time.

The inner end of the gage tube 19 has edges curled outward, as shown at 23, so

as to form a stop to engage thepackage 20,. "or rib 21 of the casing, and lnmt outward escape of the gage tube.

Said gage tube also has an aperture 24 at its outer end, preferably in its side walls, to serve as an air vent when either the piston tube engage tube moves independent of the other, it being understood that they may fit so snugly together as to preclude the free passage of air between them." A, I

The casing 1 preferably has near its end adapted to be seated upon the valve of a tlre,

preferably cut with a rectangular cross-sec- .tion into thesurface of the casing. These grooves not only enable the gage to be firmly and imperviously applied to a tire valve,

but they also distinguish the inlet end of the gage from its other end, and which ends appear about the same, when the gage tube is completely retracted.-

Having thus described the inventlon, what a I claim is:

- end bination an outer casing/g1 1; A pressure gage comprising in comforming atits interior a cylinder adapt at one end to connect with an air valve and open at the other end, a piston in said casing engagin with an air tight fit the walls of said cy der, a piston tube extendin from said piston toward the open end 0 the casing with its end adjacent the piston opening therethrough into the casing and with its other closed, a gage .tube telescopically mounted in the open end of the casing separate from the piston tube and inclosing the outer closed end portion of the same so as to be carried outward therewith, means at said open end of the casing for frictionally engaging said gage tube whereby the same will be retained at any position to which it d between said open end of the casing is pushed, and a spring mounted within the piston tube secured thereto at its closed endand extending through the other and open "nect with an air valve and open at the other end, a piston in said casing engaging with an air-tight fit the walls of said cylinder, a

. piston tube extending from said piston toward the open end of the casing with its end adjacent the piston opening therethrough into the casing and with its other end closed,

-a gage tube telescopically mounted in the open end of the casing separate from the piston tube and" inclosing the outer closed end portion of the same so as to be carried outward therewith, the outer end of said piston tube nearly filling the gage tube thereat so as to be guided thereby, means at for frictionally engaging said gage tube whereby the same will be retained at any position to which it is pushed, and a spring mounted within the piston tube secured thereto at its closed end and extending through the other and open end of the piston tube and attached to the .casing, whereby said. spring normally retracts said piston and piston tube.

3 A pressure gage comprising in combination an outer casing forming at its interior a cylinder adapted at one end to connect with an air valve and open at the other end, a piston in said casing engaging with an air-tight fit the walls of said cylinder, a piston tube extending from said piston toward the open end of the casing with its end adjacent t episton opening therethrough into the casing and with its other end closed, a gage tube telescopically mounted in the open end of the casing separate from the piston tube and inclosing the outer closed end portion of the same so as to be carried outward therewith, the-portion of the piston tube extending into the gage tube nearly filling the same so as to retain it axially coincident therewith, means at said open end of the casing for guiding and frictionally engagingsaid gage tube" whereby the same will be retained at any position to which it is pushed, said means cooperating with the piston to retain said piston tube and gage tube substantially in axial coincidence with the cylinder, and a spring mounted within the piston tube secured thereto at its .closed end and extending through the other and open end of the piston tube and attached to the casing, whereby said spring normally retracts said piston and piston tube.

4. A pressure gage comprising a casing, a pressure responslve member, and an indicator, said pressure responsive member comprising a piston in sliding contact with said casing, a rigid tubular part, .closed at its outer end, attached to said piston, and a spring within said tubular part adapted to resist movement of said part, and said indicator comprising a tubular part, arranged between said tubular part on the piston and said casing, and adapted to be moved to indicating position by the pressure responsive member.

5. A pressure gage comprising a casing, a pressure responsive member, and an indicator, said pressure responsive member comprising a piston in sliding contact with said casing, a rigid tubular part, closed at its outer end, attached to said piston at its inner end, and a spring Within said tubular part adapted to resist movement of said part, and said indicator comprising a tubular part, arranged between said tubular part on the piston and said casing, and adapted to be moved to indicating position by the pressure responsive member.

6. A pressure gage comprising a casing, a pressure responsive member and an indicat-or said pressure responsive member comprising a piston in sliding contact with said casing, a rigid tubular part, closed at its outer end, attached to said piston, and a spring within'said tubular part adapted to resist movement of said part, and said indi- ,dicating position by the pressure-responsive member said piston and tubular part thereon, and said tubular part of the indicator, being adapted to telescope with one another and the casing so as to be contained within the length of the casing when pushed together and not under pressure:

7. A pressure gage, comprising a casing, a deflator, said deflator having an air passage therethrough to the interior of the easing, said air passage comprising a groove across said deflator at one side of the center, whereby the groove is out of line with the valve-stem of a tire valve.

8. A pressure gage, comprising a casing, a plate closing the inner end of said casing, said plate having a groove circumferentially thereof, said casing having a portion thereof pressed into said groove to fasten the parts,

and said plate having a projecting part con-' stituting a valve-stem depressor, and a packing around said projecting part, said casing being turned in at its edge to form a shoulder to confine said packing.

' PRESTON E. GILLING. In the presence of- CORNELIUS ZABRISKIE, FRANCES E. BLonon'rr. 

